Electromagnetic device



C. R. HERMAN.

ELECTROMAGNETIG DEVICE.

APPLICATION FILED DEC. 1. 1921.

Patented Dec. 12, 1922.

Patented Dec. 12, 1922.

UNITED STATES PATENT OFFICE.

CARL R, HERMAN, OF GRAFTON, PENNSYLVANIA, ASSIGNOR .TO THE MORRIS AUTO- MATIC SCALE COMPANY, OF GRAFTON, PENNSYLVANIA, A CORPORATION OF SOUTH DAKOTA.

Application filed December 1, 1921.

To aZZ w/iom it may concern:

Be'it known that I, CARL R. HERMAN, a citizen of the United States, residing at Grafton, in the county of Allegheny and State of Pennsylvania, have invented certain new and us tul Improvements in Electromagnetic Devices, of which the following is a specification reference being had therein to the accompanying drawings.

This invention relates to automatic cut-oft scales and has for an object to provide in combination with a scale mechanism including a fulcrunied beam and sliding cutoff of means for holding the sliding cut-oft in open position to permit the flow material from a hopper to a receptacle, and of employing fixed magn s the ma netic attraction 0 which is at times increased by the movement or the scale beam.

A further object of the invention is to provide in combination with a scale cut-oil, of spaced magnets and electrical means it I crgziug the same, with a bridge piece &\ l ated by the SW ving of the beam to close so ine -netic circuit to strengthen the magnetic attraction of magnets to then by attract the detent as an armature to release t With these and other objects in view t is invention nprises certain novel. elements parts uni 's mocha .ical and electrical constructions, combinations and *angements, as disclosed in the drawing, together with mechanical and electri *ai equivalents ti), reolh as will hereinafter more fully described and claimed.

in the dra rings: Figure l is :1 view of a fragment of a stale inec ianism showing a part of a scale beam 40 and cut-off with the cut-oil ZLCtllfitlllg mechanisin associat (l therewith;

Figure 2 is a top plan view of the magnets and bridge piece indicated by line 2-42 01'? l iojure 1.;

Figure is a fragmentary detail vien showing the position of the parts at the in stant the magnetic circuit is closed the do sod and the switch opened be e the has Fallen;

Figure er a diagrammatic view of the lll'riii'flflts an, magnetic mechanism;

Figure 5 is a detail perspective view or. the cut-off an spring actuating mechanism, and

Figure 6 is a detail fragmentary view of 1 colon;

Serial No. 519,079.

ed in any usual and ordinary manner, as by means 0f the upr "it 13 and bearing 1%.

orted upon he frame 11 is a hooper o a disclr rge chute l6, and movable oehopper 15 and chute 16 is a and chute 16 to :1 "acre or pool-rage supported upon the attorin, not shown out connected the bear in any usual and ordinary manner. as by the rod 19.

ing; cut-oil 1'? is connected with a i 7 le er 90 by means of a link 21 and a s "v: is OlGv'l( l for the purpose of thro no; the cut-oi? from the open position shown at Fi 'ure 1 to'the closed OOSllZlOH shown at Figure Wren tho cut-ott is free move. A hand 3 us' i provides means for moving the cut-oi? to open posit on st ti tension of the 315* ch J "V to move the cut-off to closed position en release bv the detont is shown nt-ott 7;? but it is obvious that it may toengagre the cutoff in any usual known manner. This detent 24: is

:25 and is thereby free to swing:

between the posi Sl'lOVFIl at j re 1 and the -ition at Figure 4 tends to y the cor es nagnets W mroved any shown d from any approve line Wires 29 and battery 30.

Mounted convenient to the limit of move ment of the cut-oil 17 is a switch plate 31 electrically connected with the magnets as indicated more particularly at Figure 3 and a switch 32 is provided with an extremity 33 in position to be engaged by the end of the cut-off 17, as shown more particularly at Figure 3 and to be opened when the cut-off has reached the limit of its movement under the stress of the spring 22. The switch 32 is provided with a spring 34: which tends to hold the switch in closed position when free so to act, which occurs when the cut-oif has been moved to open position, as shown at Figure 1. I

It will be noted that the magnets 27 and 28 are separate and normally are not bridged, but a bridge piece 35 is provided carried by a stem 36, which in turn is carried by the beam 12. ing this bridge piece by the beam is not essential, but as shown, the spindle 3.6 is provided with slip action, as indicated at Figure 6, a constriction 37 being provided with a set screw 38 engaging therein which permits the beam to move a limited distance after the bridge 35 has engaged the tops of the cores of the magnets, as shown at Figure 3. This is not essential to the invention and a bridge piece35 carried rigidly by the beam would serve the purpose, which may be accomplished by manipulating the set screw 38 when desired.

Under normal conditions the magnetic attraction of the magnets 27 and 28 when the bridge piece 35 is not in engagement therewith, is not sufiicient to attract the armature 26 to lift the detent 24. When, however, the beam 12 is tilted by the movement of the rod 19 in the direction indicated by the arrow to bring the bridge piece 35 into engagement with the tops of the cores of the magnets 27 and 28, the bridging of such magnets will close the magnetic circuit, whereby the attraction is greatly increased to attract the armature 26 and lift the detent 2d, permitting the spring 34 to move the cut-cit 17, which, at the limit of its movement, kicks open the switch 32 and de-energizes the magnets 27 and 28. The de-energizing of these magnets makes it feasible to elevate the bridge piece 35 by the action of the beam when the receptacle or other package upon the scale platform has been removed or replaced by an empty one. By this structure electrical contact controlled by the beam has been eliminated and there is The manner of carry-,

no electrical connection between the beam and any operating part of thedevice, the bridge piece 35 only closing the magnetic circuit and not the electric circuit.

As soon as the filled receptacle has been replaced by an empty one the cut-off is manually opened, which permits the material to again flow and simultaneously the spring closes the switch but, the bridge piece, having previously been lifted by the release of the scale platform, the magnetic attraction ofthe magnets 27 and 28 is again insufiicient to attract the armature 26 until again bridged by the swaying of thebeam.

l/Vhat I claim is.

1. The combination with ascale embodying afulcrumed beam and a movable commodity cut-off, of a detentv adapted to hold the cut-off in delivery position, spaced electromagnets positioned adjacent the detent, means to energize the magnets, a bridge piece carried by the beam adapted to close the magnetic circuit of the magnets to attract the detent, and mea'ns'actuated by the movement of the released cut-off to deenergize the magnets.

2. The combination with a scale embodying a fulcrumed beam, a cut-off and means tending to close the cut-off, of a detent adapted to hold the cut-oif in open position against the tendency to close, spaced electromagnets adjacent the detent, an armature carried by the detent positioned to co-operate with the magnets, an electric circuit for energizing the magnets including a switch, a bridge piece carried by the beam proportioned to close the magnetic circuit between the magnets and attract the detent, and means carried by the cut-off to open the switch to de-energize the magnets.

3. The combination with spaced magnetic coils of an electric circuit connected with the coils and adapted to energize the same, an armature proportioned to resist the'magnetic attraction of the coils, a bridge piece. and mechanical means for moving the bridge piece to close the magnetic circuit to augment the magnetic force of the coils to overcome the resistance of the armature.

In testimony whereof I hereunto aiiiX my signature in presence of two witnesses.

CAR-L R; HERMAN.

Witnesses RUDOLPH L. YONDA, Enrrns'r PAYNE. 

